I was wanting to add space to an existing partition. I just ran out of space on my partition and figured out that I only set it up to use 20G when my HD is 40G. I was wondering if Linux had something built in that I could use to add the rest of the space on my HD to the existing partition that I have without losing the information that I have on it. If not does Partition Magic work on Linux?

I've used the GParted Live CD to do this before without losing data. But I would backup anything important ahead of time...

Different Linux Distro's use different options. In Mandriva 2007, YOU can use the Mandriva Control Center. Go to "applications", "system", "configuration", "configure your computer", and click on "mount points". IF YOUR system has the root image <Linux OS> on the last partition on the disk, add the space. IF it is an earlier partition, IMHO is best to back-up all data and then re-install the Linux Distro. There are other ways to re-size with this tool. It is up to YOU to determine how many times YOU want to move the partitions around. Good luck.